WO2007107944A1 - Signal quality reporting - Google Patents

Signal quality reporting Download PDF

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Publication number
WO2007107944A1
WO2007107944A1 PCT/IB2007/050939 IB2007050939W WO2007107944A1 WO 2007107944 A1 WO2007107944 A1 WO 2007107944A1 IB 2007050939 W IB2007050939 W IB 2007050939W WO 2007107944 A1 WO2007107944 A1 WO 2007107944A1
Authority
WO
WIPO (PCT)
Prior art keywords
radio station
signal
received signal
signal quality
indication
Prior art date
Application number
PCT/IB2007/050939
Other languages
English (en)
French (fr)
Inventor
Matthew P. J. Baker
Timothy J. Moulsley
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38194139&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2007107944(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to ES07735166T priority Critical patent/ES2390177T3/es
Priority to JP2009500995A priority patent/JP5427025B2/ja
Priority to CN2007800101636A priority patent/CN101405979B/zh
Priority to US12/293,289 priority patent/US10686553B2/en
Priority to KR1020087022706A priority patent/KR101493669B1/ko
Priority to EP07735166A priority patent/EP1999874B1/de
Publication of WO2007107944A1 publication Critical patent/WO2007107944A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding

Definitions

  • the invention relates to a method of operating a radio station, a method of operating a communication system, a radio station, and a communication system.
  • channel quality indicator (CQI) reports are transmitted from a mobile station (MS) to a base station (BS) in order to assist the BS in selecting an appropriate transmission format (e.g. modulation and coding scheme) for downlink data transmissions, and/or to assist the BS in scheduling data transmissions to different MSs.
  • UMTS Universal Mobile Telecommunication System
  • BS base station
  • CQI channel quality indicator
  • HSDPA HSDPA
  • UMTS Universal Mobile Telecommunication Standardization
  • HSDPA High Speed Downlink Packet Access
  • a signalling message to the MS at the start of the periodic reporting, and another signalling message when the period of the reporting is to be changed or the reporting terminated
  • An object of the invention is to provide improved signal quality reporting.
  • a method of operating a radio station comprising: receiving a first signal indicative of a scheduled resource which will be used to transmit a second signal to the radio station; and, in response to receiving the first signal, adapting the radio station to receive the second signal using the scheduled resource and, prior to receiving the second signal, transmitting an indication of received signal quality.
  • the invention is based on the realisation that, in a time-varying channel, efficient downlink scheduling and efficient use of adaptive modulation and coding requires up-to-date channel quality information, and that the first signal used to assign resource for transmission of a second signal can serve the additional implicit function of initiating transmission of an indication of received signal quality prior to the transmission of the second signal. In this way, the requirement for independent means of initiating the transmission of such indications is avoided, thereby improving reliability and increasing efficiency, and the indications can be more representative of the channel conditions at the time that the second signal is transmitted, also improving reliability and increasing efficiency.
  • a method of operating a communication system comprising a first radio station and a second radio station, comprising operating the first radio station in accordance with the first aspect of the invention, and at the second radio station: transmitting the first signal; receiving the indication of received signal quality transmitted by the first radio station; and employing the indication of received signal quality to select a transmission format for transmitting the second signal to the first radio station.
  • a radio station comprising: receiver means for receiving a first signal indicative of a scheduled resource which will be used to transmit a second signal to the radio station; and, control means responsive to receipt of the first signal for adapting the receiver to receive the second signal using the scheduled resource and, prior to receiving the second signal, for transmitting an indication of received signal quality.
  • a communication system comprising a first radio station in accordance with the third aspect of the invention and a second radio station, the second radio station comprising: transmitter means for transmitting the first signal; receiver means for receiving the indication of received signal quality transmitted by the first radio station; and control means adapted to employ the indication of received signal quality to select a transmission format for transmitting the second signal to the first radio station.
  • the first signal is indicative of a sequence of scheduled resources which will be used to transmit a sequence of second signals to the radio station; in response to receiving the first signal, the radio station is adapted to receive the second signals using the sequence of scheduled resources and, prior to receiving each second signal, transmit an indication of received signal quality.
  • the sequence may be periodic.
  • the radio station transmits the indication of received signal quality a predetermined time prior to receiving the or each second signal. This can be advantageous in ensuring that the indication of received signal quality is representative of the signal quality when the or each second signal is transmitted.
  • the radio station may refrain from transmitting the indication of received signal quality when the received signal quality complies with a predetermined criterion.
  • a predetermined criterion may be, as a first example, when the received signal quality is below a predetermined quality threshold, or as a second example, when the received signal quality has changed by no more than a predetermined amount in a predetermined time period.
  • Figure 1 is a block schematic diagram of a communication system
  • Figure 2 is a timing diagram illustrating the transmission of a resource allocation message, data packets, acknowledgements and CQI reports.
  • FIG. 1 there is illustrated a block schematic diagram of a communication system comprising a first radio station 100 and a second radio station 200.
  • the first radio station 100 comprises a receiver 40 for receiving resource scheduling signals and for receiving data packets transmitted by the second radio station 200.
  • the receiver 40 has an input coupled to an antenna 45 and an output coupled to a decoder 50 for decoding the received data packets.
  • the receiver 40 is adapted by a controller 80 in response to the resource scheduling signals to receive the data packets using the scheduled resources.
  • the receiver 40 may be activated at a scheduled time (and save power at other times), may be configured to receive on a prescribed frequency, or be configured to receive using a prescribed channelisation code.
  • Decoded data is delivered on an output 55 of the decoder.
  • Coupled to an output of the decoder 50 is a selector 60 that is adapted to select one of a plurality of responses, dependent on the outcome of decoding.
  • the selector 60 may select a positive acknowledgement, whereas if the decoding is unsuccessful, for example due to errors, the selector 60 may select a negative acknowledgement.
  • An output of the selector 60 is coupled to an input of an encoder 65 which encodes the response and delivers the encoded response to a transmitter 70 for transmission via the antenna 45 to the second radio station 200.
  • the receiver 40 delivers an indication of received signal quality to a controller 80 which generates a CQI report which is encoded by the encoder 65 and transmitted by the transmitter 70 to the second radio station 200.
  • the controller 80 is adapted to control the time of transmission of the CQI report. The timing of transmissions is described in detail below.
  • the second radio station 200 comprises an input 10 for receiving data for transmission, and an encoder 15 for encoding the data for transmission.
  • An output of the encoder 15 is coupled to an input of a transmitter 20, and an output of the transmitter is coupled to an antenna 25.
  • the controller 35 is further adapted to employ the received CQI report to select a transmission format, for example modulation and/or coding, for the transmission of a data packet.
  • the controller 35 is further adapted to select and schedule resources for transmission of the data packet, such as a time slot, a frequency, or a channelisation code.
  • CQI may additionally or alternatively comprise an indication of one or more characteristics of a radio channel, such as channel state, channel transfer function, angle of arrival, channel impulse response or path loss.
  • the resource allocation signal R is transmitted at time t 0 .
  • the data packet D1 is transmitted at time t 2 .
  • the first radio station 100 transmits a CQI report at time t
  • the received signal quality indicated by the CQI report is representative of the channel conditions when the data packet D1 is transmitted.
  • the data packet D1 is decoded successfully by the first radio station 100 and in response a positive acknowledgement ACK is transmitted at time t 3 .
  • the process may be repeated when a new data packet is required to be transmitted.
  • the resource scheduling signal R may be used to indicate a sequence of resources (which may optionally be periodic), thereby avoiding a sequence of transmissions of resource scheduling signals. This is illustrated in Figure 2 by the transmission of a second data packet D2 at time t 5 , with the associated CQI report just preceding at time t 4 and the response acknowledgement being transmitted at time t 6 .
  • the radio station transmits the CQI report a predetermined time prior to receiving the data packet, t 2 -ti and t 5 -t 4 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/IB2007/050939 2006-03-20 2007-03-19 Signal quality reporting WO2007107944A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
ES07735166T ES2390177T3 (es) 2006-03-20 2007-03-19 Informe de calidad de señal y transmisión de señal
JP2009500995A JP5427025B2 (ja) 2006-03-20 2007-03-19 信号品質報告
CN2007800101636A CN101405979B (zh) 2006-03-20 2007-03-19 信号质量报告
US12/293,289 US10686553B2 (en) 2006-03-20 2007-03-19 Signal quality reporting
KR1020087022706A KR101493669B1 (ko) 2006-03-20 2007-03-19 신호 품질 보고
EP07735166A EP1999874B1 (de) 2006-03-20 2007-03-19 Signalqualitätsbericht und signalübertragung

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP06111403 2006-03-20
EP06111403.9 2006-03-20
EP07300723 2007-01-11
EP07300723.9 2007-01-11

Publications (1)

Publication Number Publication Date
WO2007107944A1 true WO2007107944A1 (en) 2007-09-27

Family

ID=38194139

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2007/050939 WO2007107944A1 (en) 2006-03-20 2007-03-19 Signal quality reporting

Country Status (7)

Country Link
US (1) US10686553B2 (de)
EP (1) EP1999874B1 (de)
JP (1) JP5427025B2 (de)
KR (1) KR101493669B1 (de)
CN (1) CN101405979B (de)
ES (1) ES2390177T3 (de)
WO (1) WO2007107944A1 (de)

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WO2008108698A1 (en) * 2007-03-02 2008-09-12 Telefonaktiebolaget Lm Ericsson (Publ) Method and apparatus for resource reuse in a communication system
EP2086151A3 (de) * 2008-02-03 2011-04-27 LG Electronics Inc. Verfahren und Vorrichtung zur HARQ-Unterstützung unter Verwendung mindestens eines Übertragungsparameters eines Kanal-Qualitäts-Indikators CQI
US8369793B2 (en) 2009-10-02 2013-02-05 Telefonaktiebolaget L M Ericsson (Publ) Channel-dependent scheduling and link adaptation

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Also Published As

Publication number Publication date
US10686553B2 (en) 2020-06-16
JP5427025B2 (ja) 2014-02-26
JP2009530948A (ja) 2009-08-27
CN101405979A (zh) 2009-04-08
CN101405979B (zh) 2013-05-08
EP1999874B1 (de) 2012-07-11
ES2390177T3 (es) 2012-11-07
KR20080112235A (ko) 2008-12-24
KR101493669B1 (ko) 2015-02-16
EP1999874A1 (de) 2008-12-10
US20090075599A1 (en) 2009-03-19

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